Shen bugs?

So I feel I've encountered two bugs with Shen.

1. Shen's ult didn't cancel: This happened a few weeks ago (I forgot to report it) where I was ulting as Shen in the middle of a teamfight. Now I'm not sure which enemy champion knocked me up (may have been a Volibear) but the knock up didn't actually cancel Shen's ult. I'm not sure if knock ups don't cancel channeled abilities (I'm fairly certain that they do) and I wasn't the only one confused when this happened.

2. Taunted target ran: This one is more recent (last night) in where I taunted a under my base tower. I taunted him, but he just walked away from me while the taunt animation was still playing over his head.

Anyone else experience some Shen bugs?